Household Appliance Load Fault Detection Using Voltage Checks
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Solution Overview
Problem
In modern household appliances with complex technology, diagnosing faulty components is challenging, especially when internal communication buses connect multiple microprocessors, leading to increased diagnostic effort and costs due to uncertainty about which component is defective.
Innovation Solution
A method where a control device checks the function of electrical loads by recording and evaluating the electrical voltage across them, generating clear fault information that identifies the defective load, allowing technicians to focus repairs without examining all components, and optionally transmitting this information for remote diagnosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the appliance includes multiple electrical loads with internal communication buses and microprocessors, then the functionality and complexity of the appliance is improved, but the difficulty of detecting and measuring faulty components increases
Solution Approach 1:
The control device performs preliminary functional tests of electrical loads before a fault occurs or immediately after detection. The system proactively checks the functionality of heating elements, motors, and other electrical components by applying test voltages and measuring responses, identifying potential failures before they cause appliance malfunction. This preliminary diagnosis reduces the complexity of fault detection in complex appliances with multiple microprocessors and communication buses.
2Measurement precision
If the control device tests each electrical load individually to identify faults, then the measurement precision of fault location is improved, but the loss of time for diagnosis increases
Solution Approach 1:
The diagnostic system segments the appliance into distinct electrical load circuits, each with its own test protocol. The control device independently tests heating elements, motors, pumps, and other components by isolating their electrical circuits and applying specific test signals. This segmentation allows parallel or sequential testing of multiple loads without requiring comprehensive system shutdowns, reducing diagnostic time while maintaining precise fault identification for each segment.
Solution Approach 2:
The control device implements periodic functional testing of electrical loads at scheduled intervals during appliance operation or maintenance cycles. The system automatically performs diagnostic routines that test multiple electrical components in sequence, recording results and comparing them against threshold values. This periodic action enables comprehensive fault detection across all electrical loads without requiring continuous manual intervention, balancing thoroughness with time efficiency.
3Ease of repair
If the control device generates detailed fault information for each electrical load, then the ease of repair is improved, but the loss of information processing increases
Solution Approach 1:
The control device extracts and isolates only the critical fault information from comprehensive test results, separating essential diagnostic data from redundant measurements. When a fault is detected in an electrical load, the system extracts key parameters such as load identity, failure mode, and recommended corrective actions, while filtering out unnecessary test details. This extraction process reduces information processing requirements while providing technicians with concise, actionable fault data that improves repair efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the complexity and cost of diagnostics by clearly identifying faulty components, minimizing unnecessary technician visits and saving time and resources.
Implementation Method 1
the control device checks the function of electrical loads by recording and evaluating the electrical voltage across them
Data Source
Figure 1
AI summary
The invention relates to a method for operating a household appliance (1) comprising at least two electrical loads (2), wherein the function of at least one of the electrical loads (2) is checked by means of a control device (3) of the household appliance (1). After finding an error in the checked electrical load (2), error information which uniquely describes the faulty electrical load (2) is generated by the control device (3). The invention also relates to a corresponding household appliance (1).